05000334/LER-1980-104-03, /03L-0:on 801204,F-476 Feed Flow Protection Channel for 1A Steam Generator Failed Surveillance Test. Caused by Bad Clock Board Allowing Loop Voltage Drift on Steam Flow Input.Clock Pulse Adjusted

/03L-0:on 801204,F-476 Feed Flow Protection Channel for 1A Steam Generator Failed Surveillance Test. Caused by Bad Clock Board Allowing Loop Voltage Drift on Steam Flow Input.Clock Pulse Adjusted

ML19351F524
Person / Time
Site:	Beaver Valley
Issue date:	01/05/1981
From:	Lacey W DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19351F522	List: 05000334/LER-1980-104-03, /03L-0:on 801204,F-476 Feed Flow Protection Channel for 1A Steam Generator Failed Surveillance Test. Caused by Bad Clock Board Allowing Loop Voltage Drift on Steam Flow Input.Clock Pulse Adjusted 05000334/LER-1980-106-03, /03L-0:on 801206,inner Door of Containment Air Lock Failed Surveillance Leakage Test Per Tech Spec.Cause Not stated.O-rings Greased & Valves Tightened 05000334/LER-1980-107-03, /03L-0:on 801206,electrolyte for Detectors 101A & 101B Found Not Dripping.Caused by Clogged Wick & Glass Orifice.Wick & Orifice Cleaned & Top Vent Filter Loosened 05000334/LER-1980-108-03, /03L-0:during Maint Surveillance Procedure for Calibr of Hydrogen Analyzer H2-HY-100B,failed Function Circuit Card Found.Caused by Electronic Circuit Card Failure.Function Card Replaced 05000334/LER-1980-109-03, /03L-0:on 801208,axial Flux Difference Increased Above Target Band.Caused by High Initial Second Fuel Cycle 100% Target Flux Value.Target Flux Value Lowered ML19351F521
References
LER-80-104-03L, LER-80-104-3L, NUDOCS 8101130425
Download: ML19351F524 (2)

LER-1980-104, /03L-0:on 801204,F-476 Feed Flow Protection Channel for 1A Steam Generator Failed Surveillance Test. Caused by Bad Clock Board Allowing Loop Voltage Drift on Steam Flow Input.Clock Pulse Adjusted

Event date:
Report date:
3341980104R03 - NRC Website

text

U. S. NUCLEA2 F.E!ULATCC.Y COMMISSION EleC FORM 388 (7 77J LICENSEE EVENT REPORT CONTROL SLOCK: l l

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EVENT DESCMIPTION ANO PROSASLE CONSEQUENCES h I o 12 J l At 0315 hours0.00365 days <br />0.0875 hours <br />5.208333e-4 weeks <br />1.198575e-4 months <br /> with the reactor at 40 percent power, the F-476 feed flow protection g

The flow mismatch l gTT} l channel for the 1A Steam Generator f ailed its surveillance test.

l o 141 l trip point from FC-FW-478A to the low feed flow-low level steam generator reactor l

ITTT) I trip was found less conservative than the allowable limiC of Technical Specification l l o i s I l 3. 3.1.1.

The health and safety of the public was not ieopardized since another feed l 10171 I flow channel remained in service for the 1/2 locie inout to the reactor trip signal.)

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.a CAuSE DESCRIPTION AND CORRECT 1VE ACTIONS h g i The incident resulted from a bad clock board which allowed the loop voltage to l

m 1 drift on the steam flow input to flow comparator FC-FW-478A.

After adjusting the l

m Letock pulse, the protection channel was returned to service at 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> on 1

g i 12/4 /80. This type of incident has occurred one other time at BVPS.

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NAME OF PREPAREF:

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3 Attachment To LER 80-10'4/03L Beaver Valley Power Station Duquesne Light Company Docket No. 50-334 No further information is available or needed to satisfy the reporting requirement.

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